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Association of FMF-related (MEFV) point mutations with secondary and FMF amyloidosis

M Pamir Atagunduz1, Serhan Tuglular, Gulcin Kantarci

  • 1Department of Rheumatology, Marmara University School of Medicine, Istanbul, Turkey.

Nephron. Clinical Practice
|May 4, 2004
PubMed
Abstract

Insights

Familial Mediterranean Fever (FMF) patients show increased MEFV gene mutations, particularly M694V. While MEFV mutations are linked to amyloidosis in FMF, the M694V variant

Area of Science:

  • Genetics and Molecular Biology
  • Rheumatology and Immunology
  • Nephrology and Urology

Background:

  • Familial Mediterranean Fever (FMF) is a primary cause of AA amyloidosis in Turkey.
  • The M694V mutation in the MEFV gene is suspected to correlate with severe FMF clinical manifestations and amyloidosis.

Purpose of the Study:

  • To investigate the frequencies of three MEFV gene mutations (M694V, M680I, V726A) in FMF patients with and without amyloidosis.
  • To compare MEFV mutation prevalence in FMF-associated amyloidosis, non-FMF secondary amyloidosis, and healthy controls.

Main Methods:

  • Molecular genetic analysis using polymerase chain reaction with the ARMS method.
  • Genotyping of MEFV mutations (M694V, M680I, V726A) in four groups: AA-FMF (n=37), non-AA-FMF (n=35), secondary AA amyloidosis (S-AA, n=19), and controls (n=185).

Main Results:

  • MEFV mutations were significantly more frequent in both AA-FMF (81%) and non-AA-FMF (62.7%) patients compared to controls (4.2%).
  • AA-FMF patients exhibited a higher prevalence of MEFV mutations than non-AA-FMF patients (p=0.01).
  • M694V was the most common mutation in FMF groups, but its allele frequency and homozygous status did not significantly differ between amyloidosis and non-amyloidosis groups.

Conclusions:

  • MEFV mutations are elevated in both FMF-related and non-FMF secondary amyloidosis.
  • A direct association between the M694V mutation and amyloidosis in FMF was not clearly established, though observed in the non-FMF group.
  • MEFV mutations may indicate disease severity in other inflammatory conditions beyond FMF.

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